1988年4～6月对乌市8～17岁1007名汉族中小学生(剔除急慢性病非正常学生),采集发样1～2克,同时测身高、体重、皮脂厚度等。用美国P—Z—3030型原子吸收分光光度计直接喷样测定锌、铜、铁,用石墨炉法测定铬。用百分位数法制定本地区的正常值范围如表 From April to June 1988, 1007 Han students from 8-17 years old in Urumqi (excluding non-normal students with acute and chronic diseases) were collected. Samples of 1-2 grams of hair samples were collected, and their height, weight and sebum thickness were measured. Zinc, copper and iron were directly sprayed with a P-Z-3030 atomic absorption spectrophotometer from the United States for the determination of chromium by the graphite furnace method. Use the percentile method to set the normal range of the region as table